Telephone-exchange system.



R. S. WILBURI TELEPHONE (EXCHANGE SYSTEM;

APPLICATION H LED "AR. 8, l9l8.

Patented 'Oct. 15, 1918..

UNITED STATES PATENT- OFFICE,

RAY s. wrnnun, orrnrnniiiunsrpnnw JE3SETY,,ASSIGNOR TO WESTERN ELECTRIC comm, moonrona rsl) Q L IEWXOBK, gy a ooaPonArIoN or NEW roan.

To all whom it'may conccram, 11-5 1 .Z Be-it known that I; RAY. S.-;W1LBUR,= a citizen of 1 the United States-,wresidin at L dhurst, in; the county or' Bergemx tate, 0 uNeW Jersey, have inventedrcertaintinew and useful Improvements 1 in- Telephone-Ex, change Systems, of whichsthe followings-a su eryisory relay {and controlling atsecond r ay which is ,ener glizedyupontheg subsequent deenergizationpf-t e superyisorynelayi and coiiperates I therewith up'onmthe subsequent gnergization of .the supervisoryrelay to? in-. elude interrupter mechanism in -ciro'uiti with. the} signaling L device,; thereby; to. {furnish a reofllrsignal r'om aconnectedztelephone line; v/For-t a more complete ;-understanding of this nrentionreference should hadbathe followin description considered in connec-i tion wit the accompanying-drawing illustratingione embodiment thereof j H i Referring to the drawing, there are shown two telephone lines, A. {and 3 B, which ter-L minateiata central ofiiceat; which. is located a link circuit C for interconnecting the tele phone lines. It will be understood, of course, thatman linessimilartoA."and; ,-B may and a usually: 0 terminate at the same central office and that a plurality of link circuits similar to G may be employedtflrFor the sake of convenience, however,-only :the two telephone linesand one;link ;circuit-*are shown. a

= Subscriber A in initiating a call removes the receiver from the switchhook, causing the operation jof-line relay 4,;whereupon line lamp 5 lights. The operatorobserving the lightedcondition of the li'ne lam 5, inserts answering plug 6 of cord circuit into jack 7 of the ca ling line, whereupon=cutolf relay 12 operates over a circuit from battery through resistance 25, sleeve contacts of the plug 6and the jack 7 and the-winding of I spje ii autaor Retr at.

'PatentedOct. 15, 1918.

Application flledMaroh 8, 191a. rsenal No. 221,186.

infvoperating disconnects line relay 4 from the lme, thereby extinguishing the line lam 5,1Supervisory relay '8 is also operate whereuponr'irelay 9 operates over a circuit from battery throughconta'ct 13 of listening key 10, answering supervisory lamp 11, al ternate-contact'of the answering supervisory relay a8,-rr-ight-hand normal contact and left handminding of relay 9, sleeve contacts of the; lug-16 and-the -jack=7 and the winding ofit ezcutofii .relayI12'to-ground. Relay 9 in;op e'rating completes a-locking circuit for itselfiefrornthattery through contact 13 0f listening key 110,? the right-hand windin alternatemontact andwtheleft'hand win in otfiarelay 9,:sleeye'contacts'of the pl11g16 an the jack; 7 and-thewinding ofthe cutofi relay=12 to ground,,1:The'es'tablishment of this locking ;-c1rcuit, renders relay 9 independent otsuperrisorykelay 8.1 The operator may now; actuate listening key-10 to connect the operators telephone :8 with the cord circuit. The. actuation of this listening key opens contact 13 :ther'eoi thereby interrupting the lockin'gcircuit of relay 9, which releases its annatures.-;;=-.- a. v nTd ie operator upon being advised that con DQCUOIIIS desired with the line. of subscriber B; restores the listening key,- to normal posi tion and inserts calling-plug 152 into line jack 16. Therestoration of listeningkey 10 to normal position causes the energlzation and locking up of relay 9 in the manner already described-e The insertion of the calling plug 15 into jack 16 operates cutofi' relay 22 which disconnects the line relay from the line.

Calling supervisorylamp .18 is lighted overl acircuit from battery through-contact 14 oflistening key IO, lamp 18, normal contact of callingsupe'rx'isory relay 19, contact 20 ofi-relay 21, sleeve contactsof the calling plug "15,;and the jack 16and-the winding of 18. Relayl in'operuting causes the opera tion of relay 21 over a circuit from battery through contact 11 of listening key 10, law a 18, alternate con'ta'ct'of relay 19, left-ham" norr nal' contact 'ofrelay 21, right-hand winding thereof, sleeve contacts the plug l5 and the jack l6, and the winding of cut f y-' is ou d; i ay in aw re ing 'colnpletes'alooklng circuit" fer "itself" from battery through contadaxl-of listening.

key 10, the left-hand winding and alternate contact and the right hand' windingof relay 2-1, sleeve contacts-of .the"pluig'-16* and: the jack 16,- andsthe winding of cu'tofi relay 22 to ground; Relay-=21 is thereby'rendered independent Lof "the condition of the calling supervisory. relay 119;" i

At the conclusion of the con ersationsub scribers A and B restore thereeeiverstqthe switchhooks, causi ng the release i hi the air-' swering' and the calling supervisory relags' 8' and- 19. .[Dherrelea'se'of reIay S causes t e answering supervisory lamp 11 to be lighted over a Circuit'frbmbattery throng-b come};

13 of 'listening key 1-0;thelaihp-11;i.nornial contact of :supethisory' relay 8 'aii'd tlrelmid dle alternate contact-10f relay ground The release or thelar'r'swering supervisotfy re lay 8 also -causes the-mergrzati'olr; of relay 26 over a circuit fimm' battery thmugh ebn tact 13 of'listeni iig key it), winding of relay 26, normal contactthereof, lefit hand alter n'ate contact of relay '9,-nermal eentaet-ct supervisory relay 8 I and the middle: alternate an-inter'rupter 27 through'its left-handa1- ternate' contact to the alternate contact of answering supervisory -relay28.- The re lease of'the calling silp'ervisoryrelafm causes the calling supervisory lam-p 18"t'o be lighted over a circuit from battery through contact 14 of listening'key 10,-1a-mp 1=8;'normal contact of relay 19, and the middle alternate contact of relay 21 to ound'. Relay 28 also operates-over a circuit from 1 battery through contact 14 of listening key 10', winding of relay 28. normal contact thereof, riht-h-and alternate'contact of relay 21, norma contact of supervisory relay 19' and the middle alternate contact of'relay 2.1 to ground. Relay 28 izioperating establishes alocking. circuit for itself-from bat- -tery' through contact 14 0i listening key 10 wi-nding'and leit hand alternate contact of relay 28,1'sleeve contacts oil-plug 15 and jackglbundffR-elay 28 is now' locked up independent of the condition of the calling supervisory relay 19. The interrupter 27 now connected through the right-hand altern'ateconta'ct of relay 28" to the alternate convtact,olf,supervisory relay 19. The lighting of the twdsiipervisory lamps 11 and 18 ,serves as a ,disconnect signal to the operator, who in'ay""thereupon withdraw the plugs dirom theizjacks restoring all apparatus to normal condition.

If, before theplugsare withdrawn from the jacks 'the' subscriber initiates a recall, the answerin supervisory lamp 11 is intermittently-" lig 'ted to furnish a recall signal totheoperetor In initiatin subscriber Aremoves the receiver from the Switchback, thereby causing the operation of the' answering supervisory relay 8. The ifitertflptie'rfQ? is thereupon immediately conneem'l incircuit with the lamp 11. This circuitmay bezt'raced trom'batte'ry through o'ontact'-13 of listening key 10,'the lamp '11, the alternate contactof=the answering supervisory relay 8, left-hand alternate contact e f relay' -26 and interia'ipter' 27 to ground. The operator upon observing :the intermitlighting of: the an swering l supervisory lamp 1 1 nififiacfluate'iistening key 10 to conneat =ti1e'} eper'atcrs' telephone set =Wltl'l the a The I actuation of this listening- :10? causes 1 the r e'ale'ase of the relays 9 and" 26 associated with the answering end of the wrd'eireuitandgrelays 21 and 23 asso cia tedwi'tlrthe eallingend' thereof," The leaseot relay 26 stops theintermitten't lighting *Of"'1 li6f 1afilp"11=.""-The release of relay 2L axrdj28 '4 5ennewsthe1amp 18 in a Cll'Olllb i nelirelesvtlie sleeve contactsof the plug lomr'd'the isck- 16;-

1}? it-hadbeen' Subscniber'B who initiated the recall before-the plugs were withdrawn fmm the-jacks; the calling supervisory i relay 18 would themhave been intermittently lightedovera eireuit firoin' battery through contact 14:. of listening key-'10; the lamp 18, the alternate contact of calling supervisory relay 19;, i ight hand alternate-contact relay 28 and interrupter 27-to ground;

1'. Atelephone' exchange system comprising'a telephoneiline, a link circuit connectedtherewith, a supervisory relay inthe link circuit, a first relay, an energizing circuit therefor completed upon the energization of the supervisory'relay and including a contact thereofi-a signaling device continuo'usly operated upon the' dener -'zationo f the supervisory relay,-a second r ay, an en ergizing circuit therefor controlled by the first relay and-established upon the deenerg'i zation of the supervisory relay while the first relay is energized and includin "ab-contact ofthe denergized: supervisory re a and iatermpteemeehaaismmnneetedin er this recall,

with the signaling device upon the subsequent energization of the supervisory relay.

2. A telephone exchange system comprising a telephone line, a link circuit connected therewith, a supervisory relay in the link circuit, a first relay energized upon the energization of the supervisory relay, a signalmg device continuously operated upon the denergization of the supervisory relay, a second relay, an energizing circuit therefor controlled by the first relay and established circuit, a first relay, an energizing upon the deenergization of the supervisory relay while the first relay is energized and including a contact of the denergized supervisory relay, an operators telephone set, a listening switch for connecting the operators telephone set with the link circuit, interrupter mechanism and an operating circuit for the signaling device and the interrupter mechanism established upon the deenergization and the subsequent energize tion of the supervisory relay and i cl a contact of the listening switch.

3. A telephone exchange system ing a telephone line, a link circuit therewith, a supervisory relay in-f'tli e link the supervisory relay and includ ng tact thereof, a signaling device cont operated upon the deenergization pervlsory r l y, a second relay eh ing circult therefor eontrolle B1 relay and established upon the deiinefrgiz tion of the supervisory relay, an to telephone set, a listening switch for ou in the operators telephone .se i lin circuit, interrupter mechan' operating circuit for the sign and the interrupter mechanism upon the spbsequent energizat supervisory relay while the second energized and including a con listening switch. 4. A telephone exchange syst ing a telephone line, a link cir... ed therewith, a supervisoryielay th circuit, a first relay energized ii ergization of the supervisory relay, a ing device I continuously operated I "upo deenergization of the supervis'o relay-5 second relay, an energizing circu t therefor controlled by the first relay maestro upon the deenergization of thefsuperwiso therefor completed upon the energize "*oomprisa n k relay, an operators telephone set, a listening" switch for connecting the operators telephone set with the link circuit, interrupter mechanism, and an operating circuit for the signaling device and the interrupter mechanism established upon the subsequent energization of the supervisory relay and ineluding a contact of the energized second relay and a contact of the listening switch.

5. A telephone exchange system comprising a telephone line, a link circuit connected therewith, a supervisory relay in the link circuit, a first relay, an energizing circuit therefor completed upon the energization of the supervisory relay and including a con tact thereof, a second relay controlled by the first relay and energized upon the dec'nerg iza'tion of the supervisory relay while the first relay is energized, a locking circuit for the second relay established upon the energization thereof for rendering this relay independent of the supervisory and first relays, a signaling device, interrupter mechanism, and an operating circuit for the signaling device and interrupter mechanism established upon the subsequent energization of the supervisory relay.

p 6. A telephone exchange system compristelephone line, a link circuit connected it, a first relay having two windings, an ener izlng circuit therefor including one win ing established upon the energization lofthe supervisory relay, a locking circuit for the first relay including the other windiig -established upon the energization theref a second relay, an energizing circuit efor including a contact of the energized relay and a contact of the s p ay when deenergized, a lockin circuit for .t e second relay independent 0 the supervis'ory and first relays established upon the Qe'rgization of the second relay, a signaldevice, interrupter mechanism, and an perating circuit for the signaling device and he interrupter mechanism established upon he subsequent energization of the supervie :soi'y relay and including contacts of the supervisory and second relays.

. A telephone exchange system compris a telephone line, a link circuit connected lz tierewith, a supervisory relay in the link -cllculfi, a first relay, an energizing circuit herefor completed upon the energization of he supervisory relay and including a conct thereof, a second relay, an energizing GlIClllt therefor controlled by the energized first relay and established upon the closure of a contact of the supervisory relay when deenergized, a signaling device, interrupter mechanism, and an operating circuit for the signaling device and the interrupter mechanism controlled by the second and supervisory relays.

In witness whereof, I hereunto subscribe my name this 21st day of February, A. D.,

RAY S. WILBUR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0."

erewith, a supervisory relay for the link 

